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[PATCH] libgcc refactor aarch64 sfp-machine.h


This patch reorganizes the AArch64 sfp-machine.h file, splitting out FP_HANDLE_EXCEPTIONS into a new file sfp-exceptions.c following the same idiom used in ia64 and i386.

OK ?

Cheers
/Marcus

2012-11-15 Marcus Shawcroft <marcus.shawcroft@arm.com>

	* config/aarch64/sfp-machine.h (FP_RND_MASK): Define.
	(FP_ROUNDMODE): Use FP_RND_MASK.
	* config/aarch64/sfp-exceptions.c: New.
	* config/aarch64/sfp-machine.h (FP_HANDLE_EXCEPTIONS):
	Use __sfp_handle_exceptions.
diff --git a/libgcc/config/aarch64/sfp-exceptions.c b/libgcc/config/aarch64/sfp-exceptions.c
new file mode 100644
index 0000000..878cf8f
--- /dev/null
+++ b/libgcc/config/aarch64/sfp-exceptions.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 3, or (at your option) any
+ * later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * Under Section 7 of GPL version 3, you are granted additional
+ * permissions described in the GCC Runtime Library Exception, version
+ * 3.1, as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License and
+ * a copy of the GCC Runtime Library Exception along with this program;
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include "sfp-machine.h"
+
+void
+__sfp_handle_exceptions (int _fex)
+{
+  const float fp_max = __FLT_MAX__;
+  const float fp_min = __FLT_MIN__;
+  const float fp_1e32 = 1.0e32f;
+  const float fp_zero = 0.0;
+  const float fp_one = 1.0;
+  unsigned fpsr;
+
+  if (_fex & FP_EX_INVALID)
+    {
+      __asm__ __volatile__ ("fdiv\ts0, %s0, %s0"
+			    :
+			    : "w" (fp_zero)
+			    : "s0");
+      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
+    }
+  if (_fex & FP_EX_DIVZERO)
+    {
+      __asm__ __volatile__ ("fdiv\ts0, %s0, %s1"
+			    :
+			    : "w" (fp_one), "w" (fp_zero)
+			    : "s0");
+      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
+    }
+  if (_fex & FP_EX_OVERFLOW)
+    {
+      __asm__ __volatile__ ("fadd\ts0, %s0, %s1"
+			    :
+			    : "w" (fp_max), "w" (fp_1e32)
+			    : "s0");
+      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
+    }
+  if (_fex & FP_EX_UNDERFLOW)
+    {
+      __asm__ __volatile__ ("fmul\ts0, %s0, %s0"
+			    :
+			    : "w" (fp_min)
+			    : "s0");
+      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
+    }
+  if (_fex & FP_EX_INEXACT)
+    {
+      __asm__ __volatile__ ("fsub\ts0, %s0, %s1"
+			    :
+			    : "w" (fp_max), "w" (fp_one)
+			    : "s0");
+      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
+    }
+}
diff --git a/libgcc/config/aarch64/sfp-machine.h b/libgcc/config/aarch64/sfp-machine.h
index 3a09ae7..6c56a92 100644
--- a/libgcc/config/aarch64/sfp-machine.h
+++ b/libgcc/config/aarch64/sfp-machine.h
@@ -70,61 +70,19 @@ typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
 #define FP_EX_UNDERFLOW	0x08
 #define FP_EX_INEXACT	0x10
 
-#define FP_HANDLE_EXCEPTIONS						\
-  do {									\
-    const float fp_max = __FLT_MAX__;					\
-    const float fp_min = __FLT_MIN__;					\
-    const float fp_1e32 = 1.0e32f;					\
-    const float fp_zero = 0.0;						\
-    const float fp_one = 1.0;						\
-    unsigned fpsr;							\
-    if (_fex & FP_EX_INVALID)						\
-      {									\
-        __asm__ __volatile__ ("fdiv\ts0, %s0, %s0"			\
-			      :						\
-			      : "w" (fp_zero)				\
-			      : "s0");					\
-	__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));		\
-      }									\
-    if (_fex & FP_EX_DIVZERO)						\
-      {									\
-	__asm__ __volatile__ ("fdiv\ts0, %s0, %s1"			\
-			      :						\
-			      : "w" (fp_one), "w" (fp_zero)		\
-			      : "s0");					\
-	__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));		\
-      }									\
-    if (_fex & FP_EX_OVERFLOW)						\
-      {									\
-        __asm__ __volatile__ ("fadd\ts0, %s0, %s1"			\
-			      :						\
-			      : "w" (fp_max), "w" (fp_1e32)		\
-			      : "s0");					\
-        __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));		\
-      }									\
-    if (_fex & FP_EX_UNDERFLOW)						\
-      {									\
-	__asm__ __volatile__ ("fmul\ts0, %s0, %s0"			\
-			      :						\
-			      : "w" (fp_min)				\
-			      : "s0");					\
-	__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));		\
-      }									\
-    if (_fex & FP_EX_INEXACT)						\
-      {									\
-	__asm__ __volatile__ ("fsub\ts0, %s0, %s1"			\
-			      :						\
-			      : "w" (fp_max), "w" (fp_one)		\
-			      : "s0");					\
-	__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));		\
-      }									\
-  } while (0)
+void __sfp_handle_exceptions (int);
 
+#define FP_HANDLE_EXCEPTIONS			\
+  do {						\
+    if (__builtin_expect (_fex, 0))		\
+      __sfp_handle_exceptions (_fex);		\
+  } while (0);
 
-#define FP_RND_NEAREST		0
-#define FP_RND_ZERO		0xc00000
+#define FP_RND_NEAREST		0x000000
 #define FP_RND_PINF		0x400000
 #define FP_RND_MINF		0x800000
+#define FP_RND_ZERO		0xc00000
+#define FP_RND_MASK		0xc00000
 
 #define _FP_DECL_EX \
   unsigned long int _fpcr __attribute__ ((unused)) = FP_RND_NEAREST
@@ -135,7 +93,7 @@ typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
 			  : "=r" (_fpcr));	\
   } while (0)
 
-#define FP_ROUNDMODE (_fpcr & 0xc00000)
+#define FP_ROUNDMODE (_fpcr & FP_RND_MASK)
 
 #define	__LITTLE_ENDIAN	1234
 #define	__BIG_ENDIAN	4321
diff --git a/libgcc/config/aarch64/t-softfp b/libgcc/config/aarch64/t-softfp
index 6500b52..586dca22 100644
--- a/libgcc/config/aarch64/t-softfp
+++ b/libgcc/config/aarch64/t-softfp
@@ -5,3 +5,5 @@ softfp_truncations := tfsf tfdf
 softfp_exclude_libgcc2 := n
 
 TARGET_LIBGCC2_CFLAGS += -Wno-missing-prototypes
+
+LIB2ADD += $(srcdir)/config/aarch64/sfp-exceptions.c

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